Fix database connection leak when closing PDO connection

We discovered a resource leak (database connection leak) in our
application's test suite. We investigated and discovered that, although
the test suite was calling `CI_DB_driver::close()` after each test, the
`result_id` member variable still maintained an internal reference to
the database connection, which kept the connection from being closed.

This is using pdo_sqlsrv; I have not tested other PDO drivers.

Signed-off-by: Josh Kelley <joshkel@gmail.com>

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